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query.go
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query.go
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package tx
import (
"encoding/hex"
"encoding/json"
"fmt"
"net/http"
"strconv"
"github.com/gorilla/mux"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"github.com/spf13/viper"
abci "github.com/tendermint/abci/types"
ctypes "github.com/tendermint/tendermint/rpc/core/types"
"github.com/cosmos/cosmos-sdk/client"
"github.com/cosmos/cosmos-sdk/client/context"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/wire"
)
// Get the default command for a tx query
func QueryTxCmd(cmdr commander) *cobra.Command {
cmd := &cobra.Command{
Use: "tx [hash]",
Short: "Matches this txhash over all committed blocks",
RunE: cmdr.queryAndPrintTx,
}
cmd.Flags().StringP(client.FlagNode, "n", "tcp://localhost:46657", "Node to connect to")
// TODO: change this to false when we can
cmd.Flags().Bool(client.FlagTrustNode, true, "Don't verify proofs for responses")
return cmd
}
func (c commander) queryTx(hashHexStr string, trustNode bool) ([]byte, error) {
hash, err := hex.DecodeString(hashHexStr)
if err != nil {
return nil, err
}
// get the node
node, err := context.NewCoreContextFromViper().GetNode()
if err != nil {
return nil, err
}
res, err := node.Tx(hash, !trustNode)
if err != nil {
return nil, err
}
info, err := formatTxResult(c.cdc, res)
if err != nil {
return nil, err
}
return json.MarshalIndent(info, "", " ")
}
func formatTxResult(cdc *wire.Codec, res *ctypes.ResultTx) (txInfo, error) {
// TODO: verify the proof if requested
tx, err := parseTx(cdc, res.Tx)
if err != nil {
return txInfo{}, err
}
info := txInfo{
Height: res.Height,
Tx: tx,
Result: res.TxResult,
}
return info, nil
}
// txInfo is used to prepare info to display
type txInfo struct {
Height int64 `json:"height"`
Tx sdk.Tx `json:"tx"`
Result abci.ResponseDeliverTx `json:"result"`
}
func parseTx(cdc *wire.Codec, txBytes []byte) (sdk.Tx, error) {
var tx sdk.StdTx
err := cdc.UnmarshalBinary(txBytes, &tx)
if err != nil {
return nil, err
}
return tx, nil
}
// CMD
// command to query for a transaction
func (c commander) queryAndPrintTx(cmd *cobra.Command, args []string) error {
if len(args) != 1 || len(args[0]) == 0 {
return errors.New("You must provide a tx hash")
}
// find the key to look up the account
hashHexStr := args[0]
trustNode := viper.GetBool(client.FlagTrustNode)
output, err := c.queryTx(hashHexStr, trustNode)
if err != nil {
return err
}
fmt.Println(string(output))
return nil
}
// REST
func QueryTxRequestHandler(cdc *wire.Codec) func(http.ResponseWriter, *http.Request) {
c := commander{cdc}
return func(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
hashHexStr := vars["hash"]
trustNode, err := strconv.ParseBool(r.FormValue("trust_node"))
// trustNode defaults to true
if err != nil {
trustNode = true
}
output, err := c.queryTx(hashHexStr, trustNode)
if err != nil {
w.WriteHeader(500)
w.Write([]byte(err.Error()))
return
}
w.Write(output)
}
}